Mailing class needs more refinement

[shashank-sharma]

Right now, mails are not sent though default CKAN support but manually written and support Google SMTP
Even though it's written well (at some extent), it needs more refinement and better configuration support

Source: https://github.com/justicehub-in/ckanext-emailauth/blob/main/ckanext/emailauth/controllers/mail.py#L20

Example: https://github.com/justicehub-in/ckanext-emailauth/blob/main/ckanext/emailauth/controllers/mail.py#L54
Need better way of sending information like body, footer information and more